Add: Standalone mode

[minthemiddle]

To allow saving thought as standalone note.
Extra to the existing "Append to daily note".

[minthemiddle]

Demo of the WIP.
User can toggle the mode via cmd, or via the dropdown.
User can set individual paths per mode.

Kapture.2024-09-19.at.17.24.17.webm

[minthemiddle]

• Swapping "save" button (it was the only interactive element in the footer) with a dropdown for save mode
• Making the footer fully a setting section
• Using mono font and making it smaller to make visual separation between textarea and settings

[minthemiddle]

Final screencast.

screencast.webm